Contribution
Whistling Winds on Gridded Grounds: Acoustic Insights into Resonant Phenomena
* Presenting author
Abstract:
A client approached us due to complaints from local residents about persistent whistling noises originating from a lighthouse during windy conditions. The client requested both an investigation to identify the cause and recommendations for mitigation measures. We conducted extensive measurements around the site using Class 1 microphones and an acoustic camera. The source of the noise was pinpointed to the gridded structures of the stairs and platforms.Various theories were explored, leading to the conclusion that these grids likely act as Helmholtz resonators, producing the observed high-frequency tonal noise. Surprisingly, a review of the literature revealed no detailed descriptions of this phenomenon, despite the widespread use of grid-based stairs and platforms in industrial and maritime applications. This raises the question of why such whistling noises, which should be common in these structures, have not been more thoroughly documented.Our findings highlight the need for further research into this overlooked issue, as well as the development of effective design guidelines to prevent such noise emissions in similar installations. This study provides a foundation for addressing these challenges and improving acoustic performance in industrial structures.